falling on your face in a humurous fashion; the act of planting your face on the ground

As she rolled on the floor laughing while watching that dude whose pants fall off when he dives over the fence while he is playing baseball and falls on his face on America's Funniest Videos Jenn said, "I sure do love a good face plant!"

A trick in all freestyle sports such as skateboarding or snowboarding in which the athlete contacts the ground with his or her face. Term is derived from other tricks such as a foot plant or hand plant in that the trick involves placing a body part on the ground as part of the trick. Although wildly popular, the face plant is rarely performed on purpose.

Person 1: "Dude, that was the gnarliest face plant I've ever seen!"
Person 2: "I should go to the hospital."

An unintentional result of a risky or stupid activity whereby a person becomes fully inverted from the normal upright position while one or more parts of the face impact the ground simultaneously with the full weight of the body.

A faceplant (also face plant) is like doing a handstand except with no hands so all that's left is your face.